Appeal No. 1997-3158
Application No. 08/490,553
opposed to one end of the other yoke with a gap left between
them. The
yokes do not overlap except at the gap. This structure is
said to permit a high bit density recording, low distortion
and high sensitivity since the size of the gap can be
accurately controlled during manufacture, and it is the size
of the gap which determines the track width of the
magnetoresistive head and its recording bit density.
Independent claim 1 is reproduced as follows:
1. A magnetoresistive head which includes a
magnetic circuit including a first magnetic yoke and
a second magnetic yoke, each yoke having one end
opposed to one end of the other yoke with a gap left
therebetween, a first magnetoresistive element
magnetically coupled to the other end of said first
magnetic yoke, a second magnetoresistive element
magnetically coupled to the other end of said second
magnetic yoke, and a third magnetic yoke for
magnetically coupling said first magnetoresistive
element and second magnetoresistive element to each
other,
wherein said first and second magnetic yokes are
disposed without overlapping each other except at
said gap, and said first and second magnetoresistive
elements are formed by simultaneous disposition.
The examiner relies on the following references:
Yamada et al. (Yamada) 4,954,920 Sep. 04, 1990
Ju et al. (Ju) 5,375,023 Dec. 20,
1994
2
Page: Previous 1 2 3 4 5 6 7 Next
Last modified: November 3, 2007