Patent ID: 9360458
Filing Date: 2016-06-07
CPC Classification: G01N,H01F

Claim Text:
1. A rotary transformer for a rotary ultrasonic testing apparatus, comprising a plate-shaped stator having first coils arranged on one surface thereof, and a plate-shaped rotator having second coils arranged on one surface thereof, the respective coil-arranged surfaces of the stator and the rotator being disposed to face with each other so that signal transmission in a frequency range of 1 to 10 MHz is performed between the first coils and the second coils facing with each other, wherein the stator comprises a first substrate on which a plurality of one-turn coils as the first coils are formed into a concentric shape, and a first supporting member for supporting the first substrate; and the rotator comprises a second substrate on which one-turn coils as the second coils of same number as that of the one-turn coils formed in the stator are formed into a concentric shape, and a second supporting member for supporting the second substrate, and air or a material which is an insulator and has a relative magnetic permeability substantially equal to 1 is lying between the first substrate and the first supporting member included in the stator, and between the second substrate and the second supporting member included in the rotator.