EP 0428332 A1 19910522 - Colour holograms.
Title (en)
Colour holograms.
Title (de)
Farbhologramme.
Title (fr)
Hologrammes en couleur.
Publication
Application
Priority
GB 8925677 A 19891114
Abstract (en)
There is described holographic material which comprises coated on a photographic supporting base at least one silver halide emulsion which has a mean grain size of less than 0.1 mu m and at least one emulsion of which has been optically sensitised with at least one green sensitising dye of the following general formula I : <CHEM> wherein R1 is an optionally substituted alkyl group, R2 is hydrogen or an alkyl group having 1 to 6 carbon atoms and D represents the atoms needed to complete an optionally substituted 5- or 6- membered heterocyclic ring and at least one emulsion of which has been optically sensitised with at least one red sensitising dye of the general formula II :- <CHEM> wherein R1 is an alkyl group having 1 to 4 carbon atoms, R2 and R3 are each hydrogen, alkyl groups having 1 to 4 carbon atoms or aryl, R4 is an optionally substituted alkyl group and Y represents the atoms necessary to complete a benzothiazole or benzoselenazole nucleus, the benzene ring of which is optionally substituted. The silver halide emulsion used in the holographic material of the present invention can be used to produce a record of a holographic exposure which has been made using a laser which emits in the blue, green or red regions of the spectrum. If three exposures are made to the three regions of the visible spectrum a record of all three exposures can be obtained.
IPC 1-7
IPC 8 full level
G03C 1/035 (2006.01); G03C 1/22 (2006.01); G03C 5/00 (2006.01); G03H 1/02 (2006.01); H01M 8/06 (2006.01)
CPC (source: EP)
G03C 1/035 (2013.01); G03C 1/22 (2013.01)
Citation (search report)
- [YD] GB 2162855 A 19860212 - CIBA GEIGY AG
- [YD] EP 0225852 A2 19870616 - CIBA GEIGY AG [CH]
- [Y] GB 2057153 A 19810325 - FUJI PHOTO FILM CO LTD
- [YD] GB 1317139 A 19730516 - FUJI PHOTO FILM CO LTD
- [Y] P.Hariharan: "Optical Holography" 27 April 1984, Cambridge University Press, Cambridge,GB
Designated contracting state (EPC)
BE CH DE FR GB IT LI
DOCDB simple family (publication)
EP 0428332 A1 19910522; GB 8925677 D0 19900104; JP H03203765 A 19910905
DOCDB simple family (application)
EP 90312219 A 19901108; GB 8925677 A 19891114; JP 30637790 A 19901114