Coil, a method of construction of said coil and an imaging devic

Electric lamp and discharge devices: systems – Cathode ray tube circuits – Pulse storing

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315 85, 313240, 2505151, H01J 2906

Patent

active

050327640

ABSTRACT:
In order to compensate for the influence of magnetic fields on charged-particle beams, in particular in imaging devices provision is made for a coil constituted by a support plate of substantially constant thickness and by patterns deposited on the support in such a manner as to ensure that the absorption of electromagnetic energy is constant over the entire surface of the coil within a predetermined pass-band.
In a first embodiment, the patterns are transparent to the electromagnetic energy of a desired frequency band. In a second embodiment, complementary patterns are employed in order to obtain constant absorption over the entire surface of the coil.

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