Magnetic bubble device
First Claim
1. A magnetic bubble device comprising:
- a chip of material capable of supporting magnetic bubbles,bias means for providing a bias field across the chip, anda substrate having a chip connection portion provided with electrical connections to the chip from a plurality of electrical terminals and a flap portion provided with a printed Z coil thereon for superimposing a test magnetic field onto the bias field, which flap portion is folded back so as to lie substantially parallel to the substrate.
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Accused Products
Abstract
The specification describes a magnetic bubble device which incorporates a Z coil for providing a test magnetic field in addition to the usually provided bias field. In order to reduce package size the Z coil comprises at least one printed coil 17 formed on a substrate 15. The substrate 15 may be a flexible substrate such as polyimide film which is provided as a flap on a chip connection substrate formed from the same film, the flap folding over to lie parallel with the chip connection substrate.
The invention enables a Z coil to be provided within a package without unduly increasing package height and provides an additional advantage that the substrate which supports the Z coil may be used to protect the magnetic bubble device chip.
60 Citations
16 Claims
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1. A magnetic bubble device comprising:
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a chip of material capable of supporting magnetic bubbles, bias means for providing a bias field across the chip, and a substrate having a chip connection portion provided with electrical connections to the chip from a plurality of electrical terminals and a flap portion provided with a printed Z coil thereon for superimposing a test magnetic field onto the bias field, which flap portion is folded back so as to lie substantially parallel to the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification