Method of making an electrically heated, glass vision unit

Details Method of making an electrically heated, glass vision unit Method of making an electrically heated, glass vision unit

1986-09-11

1987-05-26

Kellogg, Arthur

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

65104, 65107, 65 593, 219203, 219543, C03B 2302, H05B 326

Patent

active

046682708

ABSTRACT:
This specification teaches a method of making an electrically heated, glass vision unit having a complex curved configuration. The method is initiated by cutting a glass substrate (10) from a flat glass bracket (12). The glass substrate (10) has first and second surfaces separated by a uniform distance. A pair of electrically conductive bus bars (16--16) are applied to one of the surfaces of the glass substrate (10). The bus bars (16--16) are so positioned on the flat glass substrate (10) that when the substrate (10) is bent to form the glass vision unit of complex curved configuration, the pair of electrically conductive bus bars (16--16) are equally distant from one another throughout their entire extent. The flat glass substrate (10) is bent to form the glass vision unit of complex curved configuration. A conductive coating (20) is applied to the one surface of the glass substrate (10) and extends between the pair of bus bars (16--16) throughout their entire extent. In this manner, when electrical energy is applied to the bus bars (16--16), a uniform flow of current takes place from one bus bar to another bus bar so that a uniformly developed heating pattern is established between the bus bars (16--16). The steps of bending the flat glass substrate and applying the conductive coating may be interchanged.

REFERENCES:
patent: 2569773 (1951-10-01), Orr
patent: 2724658 (1955-11-01), Lytle
patent: 4119425 (1978-10-01), Marriott
patent: 4543466 (1985-09-01), Ramus

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