Controlled depth etched dielectric film

Details Controlled depth etched dielectric film Controlled depth etched dielectric film

2002-09-05

2008-03-25

Lam, Cathy F. (Department: 1794)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

Alignment layer of specified composition

C174S254000, C174S258000

Reexamination Certificate

active

07348045

ABSTRACT:
A dielectric film for use as a substrate for a flexible circuit comprises a polymer selected from the group consisting of liquid crystal polymers and polyimide copolymers including carboxylic ester structural units in the polymeric backbone. The dielectric film has a thickness from about 25 μm to about 60 μm including at least one thinned, recessed region wherein the thickness is reduced to less than 15 μm, as required for use of the dielectric film in e.g. ink jet print head, hard disk drive head gimbal assembly and touch sensor applications.

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