Double winding twin coil for thin-film head writer

Details Double winding twin coil for thin-film head writer Double winding twin coil for thin-film head writer

2005-03-01

2005-03-01

Donovan, Lincoln (Department: 2832)

Inductor devices

Coil or coil turn supports or spacers

Printed circuit-type coil

C360S122000, C360S123090, C156S922000

Reexamination Certificate

active

06861937

ABSTRACT:
An enhanced inductive coil design for use in data storage magnetic disk drives with areal density over 35 Gb/in2, features a double wound twin coil that is able to achieve a yoke length of 15 μm or less by reducing the insulation spacing between the two coils. The coil further presents improved reliability by reducing the possibility of occurrence of electrical shorting. The coil is made by forming two interleafing conductors on the same layer with a demesne process. A tri-level process is implemented in the layout of the first conductor to ensure that the coil width and spacing are uniform and even, in order for the second conductor to be wound therebetween. A conformal dielectric layer of approximately 0.1 to 0.2 μm in thickness is deposited between the two conductors and serves as insulation. The two conductors are formed by a copper seed layer plating process that eliminates potential damage to the conductors during production.

REFERENCES:
patent: 4416056 (1983-11-01), Takahashi
patent: 4639289 (1987-01-01), Lazzari
patent: 4684438 (1987-08-01), Lazzari
patent: 5113300 (1992-05-01), Ikeda et al.
patent: 5396389 (1995-03-01), Terada et al.
patent: 5666249 (1997-09-01), Ohmori et al.
patent: 5671106 (1997-09-01), Lehureau
patent: 5796564 (1998-08-01), Shouji et al.
patent: 5856898 (1999-01-01), Ohashi
patent: 6074566 (2000-06-01), Hsiao et al.
patent: 6178070 (2001-01-01), Hong et al.

Affiliated with

Also associated with

Rating

Double winding twin coil for thin-film head writer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Double winding twin coil for thin-film head writer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Double winding twin coil for thin-film head writer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3407335