Disc drive flex assembly having a low particulating circuit boar

Details Disc drive flex assembly having a low particulating circuit boar Disc drive flex assembly having a low particulating circuit boar

1997-06-05

1998-11-10

Krass, Frederick

Stock material or miscellaneous articles

Circular sheet or circular blank

428 643, 428 653, 428 659, 428209, 428413, 428416, 428418, 428901, 360 9701, 360 9807, 360 9901, 360 9904, 360 9908, 360 9909, 360 9911, 360 9912, 29825, 29829, 29830, 29831, 29834, 29835, 29836, 29841, 29846, 29847, 29855, 29857, G11B 3314, B32B 302

Patent

active

058340840

ABSTRACT:
A low particulating circuit board for a disc drive flex assembly, and a method for forming the same, are disclosed. The circuit board comprises a conductive metal substrate which has sufficient thickness to provide mechanical support and backplane suppression for the circuit board and to efficiently sink heat generated by preamplifier circuitry housed by the circuit board. The substrate has dielectric layers formed on the top and bottom surfaces thereof, the dielectric layers comprising an epoxy interleaved with nonparticulating fibers, such as tetrafluorethylene (TFE) fibers. Traces and pads are provided on the dielectric layers to provide the necessary electrical connections for the preamplifier circuitry. A plurality of circuit boards are formed from a panel and subsequently cut therefrom. Particulate generation is minimized through the use of the metal substrate, as well as recession of the substrate and the solder masks to reduce the amount of material cut during the cutting operation.

REFERENCES:
patent: 5025336 (1991-06-01), Morehouse et al.

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