Claims
- 1. In combination with a cathode ray tube device enclosed in a housing, an apparatus for reducing stray pulsating magnetic fields, comprising a system of electrically insulated conducting loop circuits contained within an enclosing form, said enclosing form being disposed externally and in proximity with the housing of said cathode ray tube device.
- 2. An apparatus as recited in claim 1, wherein said enclosing form has attachment means for affixing said system in proximity to said cathode ray tube device.
- 3. An apparatus as recited in claim 1, wherein said enclosing form is an encapsulating structure, said encapsulating structure formed by conventional molding means.
- 4. An apparatus as recited in claim 1, wherein said enclosing form is of a frame geometry.
- 5. An apparatus as recited in claim 1, wherein said enclosing form is of a plate geometry.
- 6. In combination with a cathode ray tube device enclosed in a housing, an apparatus for reducing stray pulsating magnetic fields, comprising a system of electrically insulated conducting loop circuits disposed externally and in proximity with the housing of said cathode ray tube device, wherein said system of electrically insulated conducting loop circuits is a set of separate electrically insulated conducting loop subassemblies, each said subassembly containing said conducting loop circuits within an enclosing form, said subassemblies placed in different locations external to said cathode ray tube device to improve attenuation of stray magnetic fields from said cathode ray tube device.
- 7. An apparatus as recited in claim 6, wherein each said electrically insulated conducting loop subassembly contains a group of separate parallel closed loop circuits.
- 8. An apparatus as recited in claim 7, wherein said separate parallel closed loop circuits further comprise closed loop conductors.
- 9. An apparatus as recited in claim 6, wherein each said electrically insulated conducting loop subassembly contains a coil having a multiplicity of turns, the ends of said coil electrically connected together so as to form a closed circuit.
- 10. An apparatus as recited in claim 6, wherein each said electrically insulated conduction loop subassembly contains closed loop circuits taken from the group of topologies consisting of (a) a multiplicity of parallel distinct closed loop circuits and (b) a coil having ends electrically connected together.
- 11. An apparatus as recited in claim 6, wherein each said electrically insulated conducting loop subassembly preferentially affects the attenuation of a specific frequency band of stray magnetic fields emanated from said cathode ray tube device.
- 12. An apparatus as recited in claim 6, wherein said conduction loop circuits of said electrically insulated conducting loop subassembly are made electrically resonant at specific frequencies.
- 13. An apparatus as recited in claim 12, wherein said conducting loop circuits of said electrically insulated conducting loop subassembly are made electrically resonant at specific frequencies by use of series capacitors placed in said conducting loop circuits so as to resonate with the inductance of said conducting loop circuits.
- 14. An apparatus as recited in claim 6, wherein said system of electrically insulated conducting loop circuits comprises two said subassemblies, having largely planar geometries, with a first said subassembly placed immediately adjacent and beneath said cathode ray tube device with the plane of said conducting loop circuit contained therein parallel to the horizontal dimension of said cathode ray tube device, and with a second said subassembly in the form of a rectangularly-shaped planar loop having a first side placed adjacently below and parallel to the lower leading edge of said cathode ray tube device and the second side which is parallel to said first side, placed above and behind the upper leading edge of said cathode ray tube device.
- 15. An apparatus as recited in claim 14, wherein said second subassembly has affixing means for placement of said subassembly in proximity and in fixed spatial relationship to said cathode ray tube device.
- 16. A method of reducing stray pulsating magnetic fields generated by a cathode ray tube device enclosed in a housing, said method comprising the steps of:
- a) forming a system of electrically insulated conducting loop circuit subassemblies, each said electrically insulated conducting loop circuit subassembly comprising a minimum of one conducting loop within an enclosing housing; and
- b) placing said electrically insulated conducting loop circuit subassemblies in positions external and proximate to the housing of said cathode ray tube device so as to reduce stray pulsating magnetic fields generated by said cathode ray tube device without opening the housing of said cathode ray tube device.
- 17. A method as recited in claim 16, wherein said conducting loop circuits are placed in different locations external to said cathode ray tube device.
- 18. A method as recited in claim 17, wherein said system of electrically insulated conducting loop circuits comprises two said subassemblies, having largely planar geometries, with one said subassembly placed immediately adjacent and beneath said cathode ray tube device with the plane of said conducting loop circuit contained therein parallel to the horizontal dimension of said cathode ray tube device, and with a second said subassembly in the form of a rectangularly-shaped planar loop having a first side placed adjacently below and parallel to the lower leading edge of said cathode ray tube device and the second side which is parallel to said first side, placed above and behind the upper leading edge of said cathode ray tube device.
- 19. A method as recited in claim 16, wherein said conducting loop circuits are electrically resonant, said resonant loops providing improved reduction of said stray pulsating magnetic fields external to said cathode ray tube device at specific frequencies.
Parent Case Info
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of application Ser. No. 07/883,103, now abandoned, filed May 14, 1992.
US Referenced Citations (10)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
883103 |
May 1992 |
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