Magnetically shielded image dissector tube camera
First Claim
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1. A shielded electronic camera capable of being moved through axial and/or radial magnetic fields, comprising:
- (a) a nonmagnetic camera housing,(b) lens means supported by the camera housing at one end thereof,(c) an image receiving device supported within the camera housing in alignment with the lens, said device adapted to be scanned while generating a camera signal,(d) shielded deflection coil means supported within the camera housing and operatively associated with scanning the image receiving device, the coil means having a standard cylindrical mu metal shield enclosing just coils and terminating at fully open front and rear ends adjacent coil ends to attenuate essentially a radial magnetic field,(e) the standard cylindrical mu metal shield modified by axially extending cylindrical mu metal shielding means beyond at least one of the standard shield ends to attenuate an axial magnetic field, and(f) the axially extending cylindrical mu metal shielding means is adapted to include first and second mu metal end closure means, the first said end closure means having an optical opening therein adjacent to the lens, and the second said end closure means having an access opening at an end opposite the lens.
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Abstract
Image dissector camera with either of two shielding embodiments permits camera to be moveably mounted in earth'"'"'s magnetic field and strong electrical magnetic fields. Each embodiment includes one or more mu metal closure members adapted to attenuate both axial and radial magnetic fields while the camera is stationary or being moved through the magnetic fields.
21 Citations
1 Claim
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1. A shielded electronic camera capable of being moved through axial and/or radial magnetic fields, comprising:
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(a) a nonmagnetic camera housing, (b) lens means supported by the camera housing at one end thereof, (c) an image receiving device supported within the camera housing in alignment with the lens, said device adapted to be scanned while generating a camera signal, (d) shielded deflection coil means supported within the camera housing and operatively associated with scanning the image receiving device, the coil means having a standard cylindrical mu metal shield enclosing just coils and terminating at fully open front and rear ends adjacent coil ends to attenuate essentially a radial magnetic field, (e) the standard cylindrical mu metal shield modified by axially extending cylindrical mu metal shielding means beyond at least one of the standard shield ends to attenuate an axial magnetic field, and (f) the axially extending cylindrical mu metal shielding means is adapted to include first and second mu metal end closure means, the first said end closure means having an optical opening therein adjacent to the lens, and the second said end closure means having an access opening at an end opposite the lens.
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Specification
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Current AssigneeBRW Steel Corporation
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Original AssigneeBethlehem Steel Corporation (ArcelorMittal SA)
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InventorsClymer, John C., Eberhardt, Nikoli
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Primary Examiner(s)Griffin, Robert L.
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Assistant Examiner(s)Orsino, Jr., Joseph A.
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Application NumberUS05/778,512Time in Patent Office1,251 DaysField of Search358/100, 358/229, 358/245, 315/8, 313/479, 313/440, 335/214US Class Current348/374CPC Class CodesH04N 23/54 Mounting of pick-up tubes, ...
