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 Title: |
US6280838:
Optical element, a display device provided with said optical element, and a method of manufacturing the optical element
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Bernards, Thomas N. M.; Eindhoven, Netherlands
Severin-Vantilt, Marijke M. E.; St. Cyr au Mont d'Or, France
Snijkers-Hendrickx, Ingrid J. M.; Eindhoven, Netherlands
Rietjens, Gerardus H.; Stamproy, Netherlands
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| Assignee: |
U. S. Philips Corporation, New York, NY
other patents from U.S. PHILIPS CORPORATION (601715) (approx. 17,133)
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| Published / Filed: |
2001-08-28
/ 1998-01-05
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| Application Number: |
US1998000003043
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| IPC Code: |
Advanced:
F21V 3/04;
F21V 9/08;
G02B 5/23;
G02F 1/1335;
G09F 9/00;
H01J 5/08;
H01J 9/20;
H01J 29/88;
H01J 29/89;
IPC-7:
B32B 18/00;
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| ECLA Code: |
G02B5/23; H01J29/89F;
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| U.S. Class: |
Current:
428/325;
428/329;
428/331;
428/336;
428/446;
428/447;
428/913;
Original:
428/325;
428/329;
428/331;
428/336;
428/446;
428/447;
428/913;
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| Field of Search: |
428/195,204,206,212,328,329,323,331,335-336,428-429,325,451,446,447,913
359/452
313/478-479
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| Priority Number: |
| 1997-01-10 |
EP1997000200067 |
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| Abstract: |
An optical element comprising a substrate which is provided with a transparent coating (9) containing a photochromic material, the transmission of said optical element varying in the visible region in response to a variation in light. The optical element is characterized in that the coating (9) comprises an inorganic network of a silicon oxide and an organic polymer which is chemically bonded to the inorganic network via Si-C bonds. Preferably, also macroscopic particles of a metal oxide are incorporated in the network, the metal preferably being selected from the group formed by Al, Si, Ti, Zr, In and Sn. Preferably, metal-oxide particles are used whose size is above 5 nm. Such photochromic coatings (9) are scratch-resistant and demonstrate a good switching behavior. The coatings are used, for example, on display windows (3) of display devices (1) and on sunglasses. Methods of manufacturing said layers are described.
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| Attorney, Agent or Firm: |
Spain, Norman N. ;
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| Primary / Asst. Examiners: |
Hess, Bruce H.; Shewareged, B.
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| Maintenance Status: |
E1 Expired Check current status
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| INPADOC Legal Status: |
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| Designated Country: |
DE FR GB EP JP KR
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| Family: |
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First Claim:
Show all 8 claims |
What is claimed is:
1. An optical element comprising a substrate provided with a transparent coating containing a photochromic material, the transmission of said optical element in the visible range varying in response to a variation in light, characterized in that the coating comprises a hybrid network comprising a silicon oxide having an --O--Si--O-- network and an organic polymer chemically bonded to the --O--Si--O-- network via Si--C bonds, and that microscopic particles of a metal oxide are incorporated into the hybrid network, at least some of which particles are chemically bound and intertwined with the hybrid network via --Si--O-- bonds.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 20 U.S. patent(s) that reference this one
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