(19)
(11) EP 0 929 830 A1

(12)

(43) Date of publication:
21.07.1999 Bulletin 1999/29

(21) Application number: 97942986.0

(22) Date of filing: 03.10.1997
(51) International Patent Classification (IPC): 
G01J 3/ 26( . )
G02B 26/ 00( . )
 G02B 5/ 28( . )
(86) International application number:
PCT/FI1997/000600
(87) International publication number:
WO 1998/014804 (09.04.1998 Gazette 1998/14)
(84) Designated Contracting States:
DE FR GB

(30) Priority: 03.10.1996 FI 19960003976

(71) Applicants:
  • VALTION TEKNILLINEN TUTKIMUSKESKUS
    FIN-02044 VTT (FI)
  • VAISALA OYJ
    00421 Helsinki (FI)

(72) Inventors:
  • LEHTO, Ari
    FIN-00700 Helsinki (FI)
  • BLOMBERG, Martti
    FIN-01600 Vantaa (FI)
  • TORKKELI, Altti
    FIN-02610 Espoo (FI)

(74) Representative: Lipsanen, Jari Seppo Einari, et al 
Seppo Laine Oy, Itämerenkatu 3 B
00180 Helsinki
00180 Helsinki (FI)

   


(54) ELECTRICALLY ADJUSTABLE OPTICAL FILTER