Electrically heatable vision unit

Details Electrically heatable vision unit Electrically heatable vision unit

H - Electricity

05

B

309/5

H05B 3/00 (2006.01) B32B 17/10 (2006.01) E06B 7/12 (2006.01) H01C 7/00 (2006.01) H05B 3/84 (2006.01) H05B 3/86 (2006.01)

Patent

CA 1256479

Abstract This specification discloses an improved electrically heated vision unit in which heat can be concentrated in a selected zone or zones thereof. The unit includes at least one sheet of a relatively rigid transparent material (12) having a ceramic enamel (14) bonded to and extending along at least two opposite edges on one surface thereof. A pair of electrically conductive bus bars (16) are provided, one being in association with each ceramic enamel on each edge of the transparent material. Each of the bus bars have at least one narrow portion (18) overlying and bonded to an associated one of the ceramic enamel, and at least one wide portion (20) in part overlying and bonded to an associated one of said ceramic enamel and in part overlying and bonded to said one surface of the transparent material. The narrow portions and the wide portions of the pair of bus bars are in register with like portions on an opposed one of the bus bars. An electrically conductive coating (22) extends between the pair of bus bars. Sections of the conductive coating between juxtaposed wide portions of the pair of bus bars being bonded only to the wide portions of the bus bars and the one surface of the transparent material, while other sections of the conductive coating extend between juxtaposed narrow portions of the pair of bus bars being bonded to the narrow portions of the bus bars, the ceramic enamel and the one surface of the transparent material. Structure is provided for supplying electrical energy to the bus bars and through the conductive coating.

519728

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