United States Patent [19] [ii] Patent Number: 4,671,619
Kamimori et al. [45] Date of Patent: Jun. 9,1987
[54] ELECTRO-OPTIC DEVICE
[75] Inventors: Tadatoshi Kamimori, Tokyo; Junichi Nagai; Mamoru Mizuhashi, both of Yokohama, all of Japan
[73] Assignee: Asahi Glass Company, Ltd., Tokyo, Japan
[21] Appl. No.: 753,150
[22] Filed: Jul. 9,1985
[30] Foreign Application Priority Data
Jul. 24, 1984 [JP] Japan 59-152041
Jul. 24, 1984 [JP] Japan 59-152042
[51] Int. CI.4 G02F 1/01; G02F 1/23
[52] U.S. CI 350/357
[58] Field of Search 350/357
[56] References Cited
U.S. PATENT DOCUMENTS
3,708,220 1/1973 Meyers et al 350/357
4,146,454 3/1979 Haber 204/182.7
4,297,005 10/1981 Johnson, Jr. et al 350/357
4,309,081 1/1982 Camlibel et al 350/357
4,519,930 5/1985 Kakiuchi 350/357
FOREIGN PATENT DOCUMENTS
10724 1/1983 Japan 350/357
115420 7/1983 Japan 350/357
Primary Examiner—William H. Punter
Attorney, Agent, or Firm—Obion, Fisher, Spivak,
McClelland & Maier
[57] ABSTRACT
An electro-optical device containing an electrochromic material layer and electrolytic solution interposed between mutually opposed base plates, each having an electrode on the surface thereof, wherein said electrolytic solution consists essentially of (a) an iodide source material as a redox reaction promoter selected from the group consisting of metal iodides and ammonium iodides, and (b) a lactone solvent capable of dissolving the redox reaction promoter, with the proviso that when the iodide ion source material is not also a metal cation source, a cation source material capable of generating H+ or Li+ is further added.
16 Claims, 10 Drawing Figures
