 Magnetic tunnel junction magnetoresistive read head with sensing layer as rear flux guide |
| OF THE INVENTION Prior Art Referring first to FIG. 1, there is illustrated in sectional view a ... |
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| Magnetic sensor including a spin valve magnetoresistance effect film |
| An object of this invention, therefore, is to provide a magnetic sensor which allows accurate ... |
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| MR sensor with blunt contiguous junction and slow-milling-rate read gap |
| What is claimed is: 1. A transducer comprising: a magnetoresistive sensor containing plural layers ... |
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| Method and apparatus for detecting a tamper condition and isolating a circuit therefrom |
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| Magnetoresistive sensor with track following capability |
| OF THE PREFERRED EMBODIMENT The present invention is preferable for use in a magnetic head ... |
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| Method of manufacturing a planarized magnetoresistive sensor |
| The present invention is a planarized magnetoresistive head for reading magnetically stored ... |
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| Multi-layer gap structure for high resolution magnetoresistive read head |
| The present invention provides a method of constructing a narrow gap read head which will not short ... |
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| Heterojunction bipolar transistor with crystal orientation |
| An object of the present invention is to obviate the above-described defects of the prior art and ... |
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| Roof curb installation tool |
| An object of the invention is to facilitate the placement of internally flanged curbs on metal ... |
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Shaped multilayer metal foil shield structures and method of making
| Details |
Inventors: Ragland, Raymond E.; Timmerberg, Robert S.; Ragland, Christopher V.; Remke, Matthew S.; Fairchild, Stephen J.; Ragland, G. William;
Assignee: ATD Corporation (Norcross, GA)
Primary Examiner: Zimmerman; John J.
Assistant Examiner:
Attorney, Agent or Firm: Burns, Doane, Swecker & Mathis, LLP
A forge/swage formed three dimensional multilayer metal foil shield having areas therein where the layers are in a spaced apart relationship, areas therein where the layers are tensioned or stretched, and areas therein where the layers are compressed and interlocked together by folding, rolling, wrinkling, curling, coiling, crimping and the like. The multilayer metal foil shield is formed by forge/swage shaping in an appropriate mold apparatus a preform of a stack of metal foil layers having gaps between the layers. The gaps are provided by embossments in the layers or by spacers between the layers. The forge formed multilayer metal foil shields have utility as heat shields and acoustic shields, particularly on vehicles. The forge formed multilayer metal foil shields are mounted on automobile underbody areas, such as the bottom of the floor pan of the passenger compartment, to provide heat and sound insulation. Other automotive uses include fire wall, exhaust tunnel, motor mount and exhaust down pipe. The three dimensional shields include multilayer metal sheet formed structures. Intermediate beaded or rolled edge multilayer metal preforms are made for transport to the final three dimensional stamping operation. |
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DETAILED DESCRIPTION It is an object of this invention to provide a multilayer metal foil insulation structure which has sufficient structural strength to function as a stand alone unitary heat shield or acoustical shield without the necessity of the multilayer metal foil insulation being preassembled on a support member.
The multilayer metal foil structures of this invention comprise at least three metal layers at least two of which are metal foil layers having a thickness of 0.
006 in.
(0.
15 mm) or less.
It is generally preferred that the structures of this invention contain at least three layers of metal foil and more preferably will typically contain five to seven layers of metal foil.
Preferably, the metal foil layers will be 0.
005 in.
(0.
12 mm) or less with 0.
002 in.
(0.
05 mm) metal foil being a preferred thickness for interior layers in many shield applications.
In addition to the layers of metal foil, optional protective exterior layers of metal sheet on one or both sides of the shield structure can be included.
The metal sheets have a thickness greater than 0.
006 in.
(0.
15 mm) and up to about 0.
050 in.
(1.
27 mm).
The thickness of the optional exterior protective metal sheet is selected such that it can be formed and shaped as part of the unitary multilayer metal foil shield structure according to this invention.
Preferably the protective exterior metal sheet layers will be between about 0.
008 in.
(0.
20 mm) and about 0.
030 in.
(0.
76 mm).
In the multilayer metal foil structures of this invention, one or more layers of such metal sheets may be placed between the metal foil layers, if desired, for additional structural strength of the final unitary multilayer metal foil shield structure.
For some shield applications the multilayer metal foil structure can be made entirely of metal foils having a thickness of 0.
006 in.
or less, without the use of any thicker metal sheet layers.
The multilayer metal foil structures have surprising structural strength and rigidity when forge formed according to this invention
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