An apparatus utilizing a flat plate type rotary transformer which has a rotary member with a collar fixed thereon, a stationary member provided with a bearing, the rotary member being mounted on the stationary member through the collar and the bearing, a first magnet core which is securely held on the rotary member and a second magnet core which is securely held on the stationary member. The magnet cores respectively of the rotary member and the stationary member are securely set by using the surface between the rotary member and the stationary member at which the members touch as the reference level in securing the desired gap between them.
A rotary scanning device having a rotary transformer in which a transformer ring is glued to a scanning means. The effects of temperature and humidity on the rotary transformer gap spacing are reduced by utilizing a first thin layer of glue between the transformer ring and a support which extends into a hole in the scanning means, and a second layer of glue extending radially between a cylindrical surface of the support and the inner wall of the hole. A radiation transparent support, and radiation-curable glue may be used, so that the two distinct layers may be cured simultaneously by radiation directed into the support through a hole in the scanning means.
A method and apparatus for assembling a hydrodynamic bearing in a motor is provided. The method comprises affixing a first bearing upon a shaft, applying an axial tension force to the shaft, and affixing a second bearing upon the shaft in a spaced apart relation to the first bearing, as the axial force is applied to the shaft.
