Flex cable and method for lowering flex cable impedance
AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorsJohn Contreras, Luiz M. Franca-Neto, Jr-Yi Shen
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Abstract
A flex cable comprises a base film, a first adhesive layer coupled with the base film, and at least two signal traces coupled with the first adhesive layer. The flex cable comprises a second adhesive layer coupled with the signal traces and the first adhesive layer, and a cover film coupled with the second adhesive layer. The flex cable comprises an electrically conductive layer adjacent to the signal traces, and parallel with the base film and the cover film.
Claims23
A flex cable comprising:
- a base film;
- a first adhesive layer coupled with said base film;
- at least two signal traces coupled with said first adhesive layer;
- a second adhesive layer coupled with said signal traces and said first adhesive layer;
- a cover film coupled with said second adhesive layer;
- and
- an electrically conductive layer adjacent to said signal traces, and parallel with said base film and said cover film.
A hard disk drive comprising:
- a flex cable communicatively coupling an actuator assembly to a printed circuit board, said flex cable having:
- a base film;
- a first adhesive layer coupled with said base film;
- at least two signal traces coupled with said first adhesive layer;
- a second adhesive layer coupled with said signal traces and said first adhesive layer;
- a cover film coupled with said second adhesive layer;
- and
- an electrically conductive layer adjacent to said signal traces, and parallel with said base film and said cover film.
A method of lowering the impedance of a flex cable, said method comprising:
- applying a first adhesive to a base film;
- laminating a conductive foil to said base film with said first adhesive;
- etching from said conductive foil at least two signal traces;
- applying a second adhesive to a cover film;
- laminating said cover layer with said second adhesive layer to said signal traces and said first adhesive layer;
- and
- coupling an electrically conductive layer adjacent to said signal traces, and parallel with said base film and said cover film, thereby capacitively coupling said signal traces with said electrically conductive layer hence lowering the impedance of said flex cable.
Dependencies are inferred from the claim text.